Fire-pot for furnaces



0. H. WHITE.

FIRE POT FOR FURNACES.

(No Model.)

Inventor.

Patented Apr. 1, 1890.

UNITED STATES PATENT OFFICE.

CHARLES II. WHITE, OF MALDEN, MASSACHUSETTS.

FIRE-POT FOR FURNACES.

SPECIFICATION forming part of Letters Patent No. 424,634, dated. April 1, 1890.

Application filed March 2, 1889. Serial No. 301,720. (No model.)

To all whom it may concern.-

Be it known that 1, CHARLES H. W HITE, of Malden, county of Middlesex, State of Massachusetts, have invented an Improvement in Fire-Pots for Furnaces; and I do hereby declare the following to be a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

My invention relates to the fire-pot, and by fire-pot, for the purposes of this specification,

I mean that part of the combustion-chamber which contains the fuel when the fuel is being consumed, and which terminates below the fire-door for its top and at the grate (firegrate) at the bottom. All other fluted firepots have the grooves carried to the top of the fire-pot, which is fatal to the purpose sought in mine. All other fire'pots divided at the central height are so for other purposes than for a fluted and a plain section, both stat-ionary. Such designs do not aim at or secure the result I seek and produce in mine.

Referring to the drawings, Figure 1 is a plan of the fire-pot. Fig. 2 is a sectional elevation, plane of section, central and vertical. Fig. 3 is an under view of one-half of the firepot.

The fire-pot has a series of grooves running up and down its inner surface. These grooves, with the ribs which separate them, are not continuous from top to bottom, but starting from the bottom terminate at or near the middle of the fire-pot. Their termination or upper end is of a form suited to deflect the upwardcurrent of air through them inwardly toward the middle. The form shown in Fig. 1-an inwardly-slopin g angle of about forty-five degrees-is a very suitable one. The result produced by these air-channels so terminating midway up in the fire-pot at about the middle of the body of fuel is to concentrate the supply of air at the center of combustion, and so to secure the best conditions for combustion. This system of channels extending half-way up the sides of the fire-pot from the bottom, also performs an important function in delivering downward the ashes, which would otherwise obstruct the supply of air and keep the heat away from the walls, so reducing the amount radiated from their external surface. A still further important advantage is that of preventing an upward current of air, cold or imperfectly heated,fro m passing upward by the inner wall of the fire-pot into the hot chamber above the fire, so interfering with effective heating.

The upper part or half of the fire-pot may be plain or of any desired surface conformation. The outside of the lower part or half having the grooves or air-channels may, if desired, be of equal thickness for convenience in construction, or for greater strength or endurance may be made to conform more or less to the variations in thickness of the inner wall.

The fire-pot may be made in one, two, or more sections, fitted one above and upon another. A suitable and perhaps preferable di vision is the one shown in Fig. i. at about the middle of the fire'pot, allowing the channels to have their upper termination at or just below the joint between the upper and lower sections of the fire-pot. It is preferred to have both theupper and lower sections converge somewhat toward a reduced diameter at or near the middle height of the pot,son1ewhat as illustrated in Fig. 2. It is thought the best result is secured by so doin This is not essential, however, as a good result can be obtained with variations in this part of the conformation. The upper ungrooved part is marked 1), the grooves a, and the lower grooved or channeled part c.

1. The fire-pot having a series of grooves formed upon the inner surface and lower half of the fire-pot, said lower half of the fire-potflaring outward together with said grooves, said grooves being made thereby larger at the bottom than at their upper end.

2. A fire-pot divided horizontally midway in its height, the lower half being grooved upon its inner surface,bo th grooves and lower section of pot increasing in size downwardly, substantially as shown.

3. A fire-pot divided at its middle height, the lower portion having internal and external grooves, both lower section and grooves expanding or becoming larger toward the bottom, substantially as shown.

4. A fire'pot divided atits middleheight and flaring both upward and downward from the division, the lower section being grooved, substantially as described.

CHAS. ll. \VHTTE.

Witnesses:

BENJ. F. BRIGGS, DAVID N. 13. Comm.

Corrections in Letters Patent No. 424,634.

It is hereby certified that in Letters Patent No. 424,634, granted April 1,1890, upon the application of Charles H. White, of Malden, Massachusetts, for an improvement in Fire-Pots for Furnaces, errors appear in the printed specification requiring correction as follows: In line 63 the words he of should read for, and a comma should be inserted after the word thickness; in line 65 the word may should be stricken out, and in line 66 the words in thickness should be stricken out; and that the said Letters Patent should he read with these corrections therein to conform to the papers pertaining to the case in the Patent Office.

Signed, countersigned, and sealed this 29th day of April, A. D. 1890.

[SEAL.] CYRUS BUSSEY,

Assistant Secretary of the Interior. Gountersigned:

ROBERT J. FISHER,

Acting Commissioner of Patents. 

